I have a problem with a windows 2008 server that is running VPN. Configuration is as follows ..
2k8 server has 2 NICs
Internal NIC = 10.0.0.3/8
Internet NIC = 192.168.5.2/24
A Netgear DG834 on 192.168.5.1 with port 1723 forwarded to the internet NIC.
The VPN functionality was working perfectly at 22:30 last night when I restarted the server from a remote desktop session. However once the server had come back up, I re-established the VPN which all went through fine. However now when we come to send or retireve any data over the VPN or establish a rdp session. We get no reply from the server.....
Interestingly I can ping the server 10.0.0.3 and our appserver 10.0.0.9 or any other IP on the internal subnet, I can nbtstat -a the IP's and get the netbios ports, I can telnet to ports 25 etc on the main server.
However I cannot establish a remote desktop connection to EITHER server or map network drives .... after a bit of googling I came across people who had issues with MTU sizes over VPN. Testing this with a
ping -l 1342 10.0.0.3 -f
(ping 10.0.0.3 with 1342 bytes and dont fragment the packet) works fine ... however if I try with 1343 bytes of data the request times out. This was working fine yesterday, all that has happened is a reboot over night, after which im guessing some update or something has broken it. Has anyone else come across this or anything similar?